Comparison of Optical Properties and Radiation Stability of Gd2O3 Micro- and Nanopowders

IF 0.5 Q4 PHYSICS, CONDENSED MATTER Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-05-07 DOI:10.1134/S1027451024020101

M. M. Mikhailov, V. A. Goronchko, D. S. Fedosov, A. N. Lapin, S. A. Yuryev

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Abstract

The results of comparative studies of the phase composition, diffuse reflectance spectra, radiation-induced absorption spectra, and the integral absorption coefficient of solar radiation upon irradiation of micro- and nanopowders of gadolinium oxide are presented. To assess the radiation stability of optical properties, the samples were placed in a chamber of an installation simulating space conditions, where diffuse reflection spectra were recorded in the range of 0.2–2.5 μm in a vacuum of 2 × 10^–6 Torr before and after each period of electron irradiation (E = 30 keV, Φ = (1–3) × 10¹⁶ cm^–2). Micropowders of rare earth elements are used to increase the radiation stability of materials by absorbing free electrons formed in them during irradiation during their transitions from the d- to f-shell. Nanopowders of rare earth elements added to micropowders of various compounds provide an additional mechanism for increasing radiation stability due to the annihilation of primary defects formed during irradiation on nanoparticles. The result obtained in this work is opposite to these mechanisms—the radiation stability of a micropowder is significantly (more than 4 times) higher compared to a nanopowder due to more intense absorption in the ultraviolet region for the nanopowder caused by their own defects. The paper gives an explanation of the results obtained.

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Gd2O3 微粉和纳米粉体的光学特性和辐射稳定性比较

摘要介绍了对氧化钆微粉和纳米粉体的相组成、漫反射光谱、辐射诱导吸收光谱以及太阳辐射辐照时的积分吸收系数进行比较研究的结果。为了评估光学特性的辐射稳定性，将样品放置在模拟空间条件的装置中，在 2 × 10-6 托的真空中记录了每一次电子辐照（E = 30 keV, Φ = (1-3) × 1016 cm-2）前后 0.2-2.5 μm 范围内的漫反射光谱。稀土元素微粉用于吸收从 d 壳到 f 壳转变过程中形成的自由电子，从而提高材料的辐射稳定性。添加到各种化合物微粉中的稀土元素纳米粉体，由于湮灭了纳米粒子在辐照过程中形成的原生缺陷，为提高辐射稳定性提供了另一种机制。这项研究获得的结果与这些机制相反--与纳米粉体相比，微粉的辐射稳定性显著提高（4 倍以上），这是因为纳米粉体自身的缺陷在紫外线区域产生了更强烈的吸收。本文对所获得的结果进行了解释。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques PHYSICS, CONDENSED MATTER-

CiteScore

0.90

自引率

25.00%

发文量

144

审稿时长

3-8 weeks

期刊介绍： Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques publishes original articles on the topical problems of solid-state physics, materials science, experimental techniques, condensed media, nanostructures, surfaces of thin films, and phase boundaries: geometric and energetical structures of surfaces, the methods of computer simulations; physical and chemical properties and their changes upon radiation and other treatments; the methods of studies of films and surface layers of crystals (XRD, XPS, synchrotron radiation, neutron and electron diffraction, electron microscopic, scanning tunneling microscopic, atomic force microscopic studies, and other methods that provide data on the surfaces and thin films). Articles related to the methods and technics of structure studies are the focus of the journal. The journal accepts manuscripts of regular articles and reviews in English or Russian language from authors of all countries. All manuscripts are peer-reviewed.